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van den Bogaard, Ellen H.J.; van Geel, Michel; van Vlijmen-Willems, Ivonne M.J.J.; Jansen, Patrick A.M.; Peppelman, Malou; van Erp, Piet E.J.; Atalay, Selma; Venselaar, Hanka; Simon, Marleen E.H.; Joosten, Marieke; Schalkwijk, Joost; Zeeuwen, Patrick L.J.M.
Genetics in medicine, 07/2019, Volume: 21, Issue: 7Journal Article
We aimed to assess the biological and clinical significance of the human cysteine protease inhibitor cystatin M/E, encoded by the CTS6 gene, in diseases of human hair and skin. Exome and Sanger sequencing was performed to reveal the genetic cause in two related patients with hypotrichosis. Immunohistochemical, biophysical, and biochemical measurements were performed on patient skin and 3D-reconstructed skin from patient-derived keratinocytes. We identified a homozygous variant c.361C>T (p.Gln121*), resulting in a premature stop codon in exon 2 of CST6 associated with hypotrichosis, eczema, blepharitis, photophobia and impaired sweating. Enzyme assays using recombinant mutant cystatin M/E protein, generated by site-directed mutagenesis, revealed that this p.Gln121* variant was unable to inhibit any of its three target proteases (legumain and cathepsins L and V). Three-dimensional protein structure prediction confirmed the disturbance of the protease/inhibitor binding sites of legumain and cathepsins L and V in the p.Gln121* variant. The herein characterized autosomal recessive hypotrichosis syndrome indicates an important role of human cystatin M/E in epidermal homeostasis and hair follicle morphogenesis.
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